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US 3,939,095 AGranted
Dye-containing microcapsules
AssigneeBadische Anilin- & Soda-Fabrik Aktiengesellschaft
InventorsWolfgang Sliwka, Wolf-Ruediger Gaefke, Tilmann Korth
Life of this patent
Estimating the term…
Abstract
Microcapsules, particularly for the use in the manufacture of "no carbon required" copying material, which microcapsules contain as core material not only dye precursors but also mono- or poly-alkyl-substituted indans.
Claims6
Dye containing microcapsules which comprise:
- a. a capsule wall, said wall being a mixture of gelatine and gum arabic or a copolymer of from 20 to 65 percent by weight of methyl methacrylate, from 10 to 65 percent by weight of an acetyl acetate of mono(meth)-acrylates of aliphatic diols of from 2 to 8 carbon atoms, from 0 to 30 percent by weight of acrylamide, from 0 to 30 percent by weight of acrylic acid, methacrylic acid or a mixture thereof, from 0 to 30 percent by weight of vinyl pyrrolidone, from 0 to 3 percent by weight of vinylsulfonic acid or salts thereof, of 2-sulfoethyl methacrylate or salts thereof or of 2-acrylamido-2-methylpropane-sulfonic acid or salts thereof;
- and,
- b. core material consisting essentially of at least one dye and a water immiscible organic liquid consisting essentially of at least one phenylindane mono- or disubstituted by linear or branched alkyl of from 1 to 6 carbon atoms.
Microcapsules of which the core material is at least one dye and a water immiscible organic liquid consisting essentially of at least one 3-phenylindane mono- or disubstituted by linear or branched alkyl of from 1 to 6 carbon atoms;
- and the wall material is a mixture of gelatine and gum arabic or a copolymer of from 20 to 65 percent by weight of methyl methacrylate, from 10 to 65 percent by weight of an acetyl acetate of mono(meth)-acrylates of aliphatic diols of from 2 to 8 carbon atoms, from 0 to 30 percent by weight of acrylamide, from 0 to 30 percent by weight of acrylic acid, methacrylic acid or a mixture thereof, from 0 to 30 percent by weight of vinyl pyrrolidone, from 0 to 3 percent by weight of vinylsulfonic acid or salts thereof, of 2-sulfoethyl methacrylate or salts thereof or of 2-acrylamido-2-methylpropane-sulfonic acid or salts thereof.
Dependencies are inferred from the claim text.